Saving $5 might not be a big deal, but this one-day offer from Amazon still amounts to 50% off or double your money (sweet). The offer is available through AmazonLocal, Amazon's daily deals site. As a bonus, Amazon Visa holders get 25 points too.

There's a limit of one giftcard per household.

After you turn $5 into a $10 Amazon giftcard, you'll find the code under "Your Vouchers." Use it to buy MP3s, books, or whatever—or email the code to a friend. If you're not already an AmazonLocal member, you'll need to sign up first (and then get ready to set up email filters for the offers and track daily deals you buy).